31375140 has 24 divisors (see below), whose sum is σ = 87850560. Its totient is φ = 8366688.

The previous prime is 31375121. The next prime is 31375147. The reversal of 31375140 is 4157313.

It is a self number, because there is not a number n which added to its sum of digits gives 31375140.

It is not an unprimeable number, because it can be changed into a prime (31375147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261400 + ... + 261519.

It is an arithmetic number, because the mean of its divisors is an integer number (3660440).

Almost surely, 2^31375140 is an apocalyptic number.

31375140 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31375140 is an abundant number, since it is smaller than the sum of its proper divisors (56475420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31375140 is a wasteful number, since it uses less digits than its factorization.

31375140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 522931 (or 522929 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 24.

The square root of 31375140 is about 5601.3516225997. The cubic root of 31375140 is about 315.4001465528.

The spelling of 31375140 in words is "thirty-one million, three hundred seventy-five thousand, one hundred forty".